Door-hanger



UNITED STATES CHARLES W. BULLARD,

PATENT OFFICE.

OF CHICAGO, ILLINOIS.

DOOR-HANGER.

SPECIFICATION forming part of Letters Patent No. 254,605, dated March '7, 18 82.

Application filed January 26, 1882. (No model.)

To all whom it may concern: I

Be it known that I, CHARLES W. BULLARD, a citizen of the United States, residing at the city of Chicago, in the county of Cook and State of Illinois, have invented certain new and useful Improvements in Door-Hangers, which are fully set forth in the following specification, reference beinghad to the accom pan ying'drawings, in which- Figure 1 is an end elevation of a door-hanger provided with my improvements. Fig. 2 is a. section on the line as w in Fig. 1. Fig. 3 is a transverse vertical section of the sheave in detail, the joint-bolt being shown in dotted lines. Fig. 4 is a section on the line 3 g in Fig. 3.

.The same letters denote the same parts in all the figures.

My invention relates to apparatus for the suspension of sliding doors, and particularly to such apparatus in which the door is held up byjoint-bolts having their bearing directly or indirectly on sheaves which run on a double track above the door. I11 Patent No. 233,836, issued November 2, 1880, I have shown such a device, in which the bolts are secured at their upper ends to a hearing-rail resting on the axles ofa pair of sheaves, and I still regard this as the best apparatus where thoroughly substantial work is requisite. In order, however, to avoid an expense unnecessary for the lighter classes ofwork, and secure at the same time the advantages of propelling the door with a minimum of friction and of maintaining its balance, even when the stndding has sagged, I have devised the apparatus which I will now proceed to describe.

In the drawings, A denotes the studding of the double partition within which the doorhanger is set. B denotes the track-rails bolted to the studding, C the wheels, and C the cylindrical axle of the sheave which runs on this track, the wheels being rigidly affixed to the axle. None of these present any feature of novelty.

On the axle I set a box or washer, D, as close as is consistent-with allowing the axle to turn freely within it. This box, which is preterably made of anti friction n1etal, is rectangular in fundamental form, the axle passing. through it a little above the middle point of its altitude. 0n the top' and at the ends it has a cylindrical groove, d, adapted to receive the hooked upper end of a cylindrical jointbolt, E, the lower end of which is affixed to the door F near one of its upper corners, the other upper corner having of course a similar bolt resting in the same way on a similar box and sheave. By this arrangement the entire friction incident to the propulsion of the door is confined to the contiguous surfaces of the box D and the axle C, the joint-bolt and the box having no motion relatively to each other.

The friction and consequently the wear are thus much less than if a joint-bolt of iron or other practicable material were directly in contact with an iron axle.

On account of the cylindrical form of the joint-bolt, thebolt, and cori'sequently the door, remain perpendicular, although by reason .of sagging, one of the track-railsB may be higher than the other. The conformation of the grooved obviously admits of thebox turning on the cylindrical portion of joint-bolt E in such a case.

What I claim as my invention, and desire to secure by Letters Patent, is-- 1. The joint-bolt E, cylindrical and hooked at its upper end, in combination with the sheave C C, substantially as and for the purpose described.

2'. The joint-bolt E, in combination with the box D and sheave C C, substantially as and for the purpose described.

CHARLES W. BULLARD. 

